You are on the right track, your neck bearings are likely seizing. Unfortunately, those among us who have a size 14 neck are more-likely to have neck bearing seizures due to the lack of robust material to bear the weight of the ponderous VMax bulk in its performance mode, and especially, any time V-Boost initiates a takeoff sequence. Why is this? Compared to ordinary bikes,
this is what V-Boost feels like:
"Skrinking" of 'nads can be successfully permanently counteracted by riding a Suzuki GS500 instead of the VMax.